Himalayan salt contains iron, calcium, iron, and magnesium.
Lemons contain vitamin C, potassium, fiber, etc.
If you are fasting, it may be a good idea to get those electrolytes. Even if not, this seems like a healthy drink; certainly better what I people see drinking at my office.
People might not want to macro dose iodine, so that rules out table salt.
Most importantly: it tastes good!